drm/i915/dvo: implement get_hw_state

Similar to the sdvo code we poke the dvo encoder whether the output is
active. Safe that dvo encoders are not standardized, so this requires
a new callback into the dvo chip driver.

Hence implement that for all 6 dvo drivers.

v2: With the newly added ns2501 we now have 6 dvo drivers instead of
just 5 ...

Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/dvo_ch7xxx.c b/drivers/gpu/drm/i915/dvo_ch7xxx.c
index c1dea5b11f91..38f3a6cb8c7d 100644
--- a/drivers/gpu/drm/i915/dvo_ch7xxx.c
+++ b/drivers/gpu/drm/i915/dvo_ch7xxx.c
@@ -297,6 +297,18 @@ static void ch7xxx_dpms(struct intel_dvo_device *dvo, bool enable)
                 ch7xxx_writeb(dvo, CH7xxx_PM, CH7xxx_PM_FPD);
 }
 
+static bool ch7xxx_get_hw_state(struct intel_dvo_device *dvo)
+{
+        u8 val;
+
+        ch7xxx_readb(dvo, CH7xxx_PM, &val);
+
+        if (val & CH7xxx_PM_FPD)
+                return false;
+        else
+                return true;
+}
+
 static void ch7xxx_dump_regs(struct intel_dvo_device *dvo)
 {
         int i;
@@ -326,6 +338,7 @@ struct intel_dvo_dev_ops ch7xxx_ops = {
         .mode_valid = ch7xxx_mode_valid,
         .mode_set = ch7xxx_mode_set,
         .dpms = ch7xxx_dpms,
+        .get_hw_state = ch7xxx_get_hw_state,
         .dump_regs = ch7xxx_dump_regs,
         .destroy = ch7xxx_destroy,
 };